Coupler (Hollow Internally Threaded Bar) Female ½", Length ¾"
These can be used to give an unswitched lampholder a little extra height on the top of a Standard lamp. For example, for repairing a wooden standard lamp, fix a 1/2 flange plate to the top of the lamp. Use a 1/2 locknut cover to give neat finish, then screw this 1/2 coupler to the flange plate. Then thread a 1/2" brass all thread 3/4" length into coupler. This leaves the correct amount of thread protruding to fix a half inch lampholder to. The result is stunning.
Before starting any electrical work, always switch off at the mains. If in doubt consult a competent electrician